UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

~~FORM~~ Form 8-K

~~CURRENT~~Current ~~REPORT~~Report

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~July~~August 2910, 2005

Unocal Corporation

(Exact name of registrant as specified in its charter)

Delaware	1-8483	9520-~~3825062~~2659678
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)
(State or other jurisdiction of incorporation )	(Commission File Number)	(I.R.S. Employer No.)

2141 Rosecrans Avenue, Suite 4000
6001 Bollinger Canyon Road San Ramon, California		94583
El Segundo, California		90245
(Address of principal executive offices)		(Zip Code)
(Address of Principal Executive Offices)		(Zip Code)

(Registrant’s telephone number, including area code: (925) 842-1000

~~Former name or former address, if changed since last report: N/A~~NONE

þ(Former ~~Written~~name ~~communications~~or ~~pursuant~~former toaddress, ~~Rule~~if ~~425~~changed ~~under~~since ~~the~~last ~~Securities Act (17 CFR 230.425~~report)

¨Check ~~Soliciting~~the ~~material~~appropriate ~~pursuant~~box tobelow ~~Rule~~if ~~14a~~the Form 8-12K ~~under~~filing is intended to simultaneously satisfy the filing ~~Exchange~~obligations ~~Act~~of ~~(17~~the ~~CFR~~registrant ~~240.14a-12)~~under any of the following provisions:

¨o Written ~~Pre-commencement~~ communications pursuant to Rule 425 ~~14d-2(b)~~ under the ~~Exchange~~Securities Act (17 CFR ~~240~~230.~~14d-2(b~~425))

¨o Soliciting ~~Pre-commencement~~material ~~communications~~ pursuant to Rule ~~13e~~ 14a-~~4(c)~~12 under the Exchange Act (17 CFR 240.~~14d~~14a-~~2(b~~12))

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events

In On ~~connection~~August 10, ~~with~~2005, ~~the~~Unocal ~~settlement~~Corporation ofissued a ~~consolidated~~ ~~putative~~press ~~stockholder~~release ~~class~~announcing ~~action~~that ~~lawsuit~~Unocal’s stockholders ~~brought~~had ~~against Unocal~~approved ~~and~~the ~~its~~merger ~~directors~~with ~~and~~Blue ~~challenging~~Merger ~~certain~~Sub ~~aspects~~Inc., ofa ~~the~~wholly ~~proposed~~owned subsidiary of Chevron ~~merger~~Corporation, ~~Unocal~~and ~~agreed~~that tothe ~~make~~merger ~~additional~~had ~~disclosures~~been ~~to Unocal’s stockholders~~completed. ~~The~~A ~~“Additional~~copy ~~Disclosure~~of ~~Relating to~~ the ~~Proposed~~press ~~Merger~~release ~~with Chevron Corporation,”~~ dated ~~July~~ August 2910, 2005, is attached as Exhibit 99.1 ~~hereto~~to this Current Report and is incorporated herein by reference ~~herein~~.

Item 9.01 Financial Statements and Exhibits

Exhibit No.		Description
99.1		Additional Disclosure Relating to the Proposed Merger with Chevron Corporation, dated July 29, 2005

SIGNATURES


Number		Exhibit
99.1		Press release dated August 10, 2005 announcing the consummation of the merger with Blue Merger Sub Inc., a wholly owned subsidiary of Chevron Corporation.

~~Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly~~SIGNATURE ~~caused this report to be signed on its behalf by the undersigned thereunto duly authorized.~~

~~UNOCAL~~Pursuant ~~CORPORATION~~to ~~/s/~~the ~~Bryan~~requirements J.of ~~Pechersky~~the ~~By:~~Securities ~~Bryan~~Exchange J.Act ~~Pechersky~~of ~~Corporate~~1934, ~~Secretary~~the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 29, 2005


Dated: August 10, 2005
	UNOCAL CORPORATION
	By:	/s/ K. C. SCHAFER
		K.C. Schafer
		Assistant Secretary (Duly Authorized Officer)

EXHIBIT INDEX

Exhibit No.		Description
Number		Exhibit
99.1		~~Additional~~Press ~~Disclosure~~release ~~Relating~~dated toAugust 10, 2005 announcing the ~~Proposed~~consummation ~~Merger~~of the merger with ~~Chevron~~Blue ~~Corporation~~Merger Sub Inc., ~~dated~~a ~~July~~wholly ~~29,~~owned ~~2005~~subsidiary of Chevron Corporation.

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